contrib/storage-druid/src/main/java/org/apache/drill/exec/store/druid/common/DruidFilterBase.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.drill.exec.store.druid.common;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.drill.common.util.JacksonUtils;

public class DruidFilterBase implements DruidFilter {
  private static final ObjectMapper objectMapper = JacksonUtils.createObjectMapper();

  public String toJson() {
    try {
      return objectMapper.writeValueAsString(this);
    } catch (JsonProcessingException e) {
      e.printStackTrace();
      return "";
    }
  }
}